python数据抓取
encoding=utf-8
#@description：蜘蛛抓取内容。
import Queue
import threading
import urllib,urllib2
import time
from BeautifulSoup import BeautifulSoup
hosts = ["http://www.baidu.com","http://www.163.com"]#要抓取的网页
queue = Queue.Queue()
out_queue = Queue.Queue()
class ThreadUrl(threading.Thread):
"""Threaded Url Grab"""
def __init__(self, queue, out_queue):
threading.Thread.__init__(self)
self.queue = queue
self.out_queue = out_queue
def run(self):
while True:
#grabs host from queue
host = self.queue.get()
proxy_support = urllib2.ProxyHandler({'http':'http://xxx.xxx.xxx.xxxx'})#代理IP
opener = urllib2.build_opener(proxy_support, urllib2.HTTPHandler)
urllib2.install_opener(opener)
#grabs urls of hosts and then grabs chunk of webpage
url = urllib.urlopen(host)
chunk = url.read()
#place chunk into out queue
self.out_queue.put(chunk)
#signals to queue job is done
self.queue.task_done()
class DatamineThread(threading.Thread):
"""Threaded Url Grab"""
def __init__(self, out_queue):
threading.Thread.__init__(self)
self.out_queue = out_queue
def run(self):
while True:
#grabs host from queue
chunk = self.out_queue.get()
#parse the chunk
soup = BeautifulSoup(chunk)
print soup.findAll(['title'])
#signals to queue job is done
self.out_queue.task_done()
start = time.time()
def main():
#spawn a pool of threads, and pass them queue instance
t = ThreadUrl(queue, out_queue)
t.setDaemon(True)
t.start()
#populate queue with data
for host in hosts:
queue.put(host)
dt = DatamineThread(out_queue)
dt.setDaemon(True)
dt.start()
#wait on the queue until everything has been processed
queue.join()
out_queue.join()
main()
print "Elapsed Time: %s" % (time.time() - start)
